Improvement in tugs for towing boats



didnt State giganti effin,

WALTER nvnnson,l or NEW Yo'nK, N. v.

Letters Patent No.` 110,754, dated January 3, 1871.

IMPROVEMENT IN TUGS FOR TOWING BOATS- 'The Schedule referred to in these Letters Patent and-making Part of theA same.

To all whom 'it may concern: v

Be it known that I, WALTER Evnnsos, of the city of 1New York, in the county and State of New York, have invented a new and improved Tug for Towing Canal-Boats; -and I do hereby declare that the following is a full, clear, and exactv descriptionl thereof, which will enable others skilled in ,the 'art to make and use the same, reference heilig had to the same.

Similar letters of reference indicate corresponding parts.

This invention is especially designed for use on canals; and

lts objects are. to secure strength and compactness of construction, with increased efficiency in towing, and to prevent the washing of the banks' by obviating the usual side swell; the two last-named results being secured by a form which is such as to confine the water acted upon by the wheel inla longitudinal channel of the hull, so that its expulsion is directly backward; and

It consists in forming the tug with a two-deckhull, with its lower hold divided by a central longitudinal water-channel having parallel and vertical sides, forming twin lobes or sub-hulls on each side, and with stanchions extending from the keel-timbers to the upper deck, both on the sides ot' the central channel and the outer' sides ot'- the boat.

In the drawing the construction is most clearly shown in figs. and 3 A being the upper portion, comprising the space between the upper deck and the lower or intermediate deck H g B l, thc two sub-hulls; and

D, the water-channel. l

The stanchions :l (l extend from the keel-timbers c e to the upper deck, the timbers of which and the intermediate deck Il are framed thereto, and the outer stanchions b b are in the same manner continuous from the bottom of the suh-hulls to the upper dock;

The deck-timbers 1I extend from outside to outsillo of the hull, except where thcyarc cut through to form a space for the reception ot thc wheel li, and are planked and caulked on the under side in the space between the sub-hulls.

Two rudders, F F, are employed, one to each subhull, their arms being connected by the rod a a so vas to operate together.

The inncr sides of the sub-hulls are straight and parallel, but may becurved on the outer side, according to approved modes of marine construction.

The channel 1) forms a trunk or passage-way, in which the water is set in motion by the paddle-wheel or other'proponen-arid escapes freely, but is confined t0 a course which is directly astern, whereby its force is measurably expended in driving the boat forward.

yThe sub-hulls prevent -thc spreading of' the currents laterally, thereby preventing the washing of the banks.

The construction greatly increases the strength ot'- the vessel,l there being a double set ot' stanchions in the intermediate upright timbers d d, which, with the planking and double keel and deck-timbers, all connected therewith, make the hull to consist virtually ot' five longitudinal connected trunks or tubes, whereas a two-decked vessel of ordinary construct-ion would represent one trunk only, with a horizontal partition.'

Heretofore boats have. been' constructed with a singie deck or platform resting upon two separate hulls, each ot' complete l'orm in itself; but such hulls are formed with convex inner as woll as outer sides, and do not form the same parallel vertical sided wat-erway, and hence re not effective citherinconfining the currentsl from spreading or in aiding in the 'prof pulsion of the boat; and the hulls, being only connected by a single deck, do not possess the strength et' structure or unity of plan which belongs to my invention, but are especially weak in that the action of one hull in uudulatory water produces, by lever age, a strain upon the deck connection with the other, tending to dissever them-an etlc'ct which cannot 0ccur in my mode of construction.

The lobes or sub-hulls of my tug represent, in form, an ordinary hull biscctcd longitudinally and separated, but in structure vthey are so united by the combination of the intermediate timbers and walls as to form a unitary lmll ofcxtraordinary strength.

A hull constructed ot' the body A and twin subhulls B B, formed by thc vertical stanchio'ns d d, said sub-hulls, together with the intermediate deck H H, forming a parallel water-way fronrsteom to stern, sub. stautially as and for the purposes set forth.

WALTERA EVERSON.

Witnesses:

(ino. W. Manna, Amex. F. ltomsnrs. l 

